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revStackrec.java
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51 lines (43 loc) · 754 Bytes
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import java.util.Stack;
public class revStackrec {
static Stack<Character> s = new Stack<>();
public static void reverse() {
if(s.isEmpty()) {
return;
} else {
char top = s.peek();
s.pop();
reverse();
insertAtBottom(top);
}
}
private static void insertAtBottom(char top) {
if(s.isEmpty()) {
s.push(top);
} else {
char element = s.peek();
s.pop();
insertAtBottom(top);
s.push(element);
}
}
private static void display() {
while(!s.isEmpty()) {
System.out.println(s.pop());
}
}
public static void main(String[] args)
{
s.push('1');
s.push('2');
s.push('3');
s.push('4');
display();
s.push('1');
s.push('2');
s.push('3');
s.push('4');
reverse();
display();
}
}